Visual C++ doesn't operator<< overload
- by PierreBdR
I have a vector class that I want to be able to input/output from a QTextStream object. The forward declaration of my vector class is:
namespace util {
template <size_t dim, typename T>
class Vector;
}
I define the operator<< as:
namespace util {
template <size_t dim, typename T>
QTextStream& operator<<(QTextStream& out, const util::Vector<dim,T>& vec)
{
...
}
template <size_t dim, typename T>
QTextStream& operator>>(QTextStream& in,util::Vector<dim,T>& vec)
{
..
}
}
However, if I ty to use these operators, Visual C++ returns this error:
error C2678: binary '<<' : no operator found which takes a left-hand operand of type 'QTextStream' (or there is no acceptable conversion)
A few things I tried:
Originaly, the methods were defined as friends of the template, and it is working fine this way with g++.
The methods have been moved outside the namespace util
I changed the definition of the templates to fit what I found on various Visual C++ websites.
The original friend declaration is:
friend QTextStream& operator>>(QTextStream& ss, Vector& in) { ... }
The "Visual C++ adapted" version is:
friend QTextStream& operator>> <dim,T>(QTextStream& ss, Vector<dim,T>& in);
with the function pre-declared before the class and implemented after. I checked the file is correctly included using:
#pragma message ("Including vector header")
And everything seems fine. Doesn anyone has any idea what might be wrong?
